Top panel: calibrated rest-frame spectrum of SDSS000807.27-103942.7 before continuum substraction. Abscissa is rest-frame wavelength in Å, while ordinate is specific flux in units 10⁻¹⁵ erg s⁻¹ cm⁻² Hz⁻¹. Global or local continuum are specified by a continuous line. Dot-dashed vertical lines identify the position at rest-frame of the strongest emission lines. Bottom panel: multicomponent fits after continuum subtraction for the Si IV1397, C IV1549 and 1900 Å blend spectral ranges. In all the panels the continuous black line marks the broad component at rest-frame associated to Si IV1397, C IV1549, Al IIIλ1860 and Si III]1892 respectively, while the blue one corresponds to the blueshifted component associated to each emission. Dashed pink line marks the fit to the whole spectrum. Absorption lines are indicated by a brown line. Dot-dashed vertical lines correspond to the rest-frame of each emission line. In the Si IV1397 spectral range, the cyan line marks the contribution of O I + S  II 1304 blend, while the magenta line corresponds to the C II1335 emission line. In the C IV1549 region, N IV1486 is represented by a cyan line, while the yellow one corresponds to the O III1663 + Al II1670 blend. In the 1900 Å blend range, Fe III and Fe II contributions are traced by dark and pale green lines respectively, magenta lines marks the N III]1750 and the yellow one corresponds to the Si III1816. Lower panels correspond to the residuals, abscissa is in radial velocity units km s.